Uterus, Endometrium - Hyperplasia, Atypical in a female Wistar Han rat from a chronic study (higher magnification of Figure 1). There are multiple infoldings and projections of the endometrium into the uterine lumen.

Uterus, Endometrium - Hyperplasia, Atypical in a female Wistar Han rat from a chronic study. The epithelium lining the uterine lumen projects into the lumen in irregular papillary fronds.